Cu					Zn
Serial number	Recommen-ded value	Analysis value	Absolute error	Relative error (%)	Recommen-ded value	Analysis value	Absolute error	Relative error (%)
A1	4.371	4.372	0.000	0.000	0.039	0.039	0.001	1.400
A2	0.081	0.081	0.001	0.980	0.005	0.005	−0.000	−2.680
A3	0.081	0.081	−0.002	−1.790	0.004	0.004	−0.000	−5.570
A5	0.260	0.260	0.001	0.390	0.100	0.010	−0.003	−2.750
A6	1.777	1.776	−0.001	−0.030	5.792	5.792	0.000	0.000
Ave	1.314	1.315	0.001	0.061	0.994	1.000	0.001	0.070